*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19831
19840
19850
19860
19870
19880
19890
19901
19910
19921
19930
19940
19950
19961
19970
19980
19990
20000
20010
20022
20030
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20140
20150
20161
20170
20180
20192
20201
20212
20220
20231
20240
Total15